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Recommendation system by: Public institution

Manual de Fertilização das Culturas (Manual of Crop Fertilization)

The manual includes a range of information on soil fertility and the nutrition and fertilisation of the main agricultural crops. The aim of the manual is to help farmers on their holdings to ensure rational fertilisation of crops, in economic and environmental terms, while safeguarding natural resources.

Access the recommendation system

Wheat
Maize
Potatoes
Nitrogen
Phosphorus
Potassium

Publisher Public institution
Name Manual de Fertilização das Culturas (Manual of Crop Fertilization)
Weblink https://www.iniav.pt/images/publicacoes/livros-manuais/Manual_Fertilizacao_das_culturas.pdf
Countries covered Portugal
Regions covered The recommendation system does not specify country regions.
Language Portugese

Crops covered Wheat, Maize, Potatoes, Vegetables, Cover crops, Other cereals, Brassicas
Nutrients covered Nitrogen (N), Phosphorus (P), Potassium (K), Sulphur (S), Calcium (Ca), Magnesium (Mg), Boron (B), Copper (Cu), Iron (Fe), Manganese (Mn), Sodium (Na), Zinc (Zn)
Target soil pH Recommendations based on soil and cropping types Provided

Nitrogen
Crops for Nitrogen Recommendation None
Nitrogen Analysis Options Organic matter
Soil Nitrogen Assess Method Estimated
Factors for estimated Soil Mineral N Soil type, Rainfall, Past management, Current crop status
Soil Nitrogen content measurement None
Phosphorus
Crops for Phosphorus Recommendation Maize, Potatoes, Wheat
Soil Phosphorus content measurement Lab based method
Phosphorus Sampling Frequency Annually
Lab analysis method for Phosphorus Modified Egner-Riehm method;
Potassium
Crops for Potassium Recommendation Maize, Potatoes, Wheat
Soil Potassium content measurement Lab based analysis
Lab analysis method for Potassium Modified Egner-Riehm method;
Potassium Sampling Frequency Annually
Potassium Measurement Method None
Soil available Potassium(Κ) from potash clays Does not account for potash releasing clays

Guidance for minimizing nitrate leaching Provided
Crops for which the recommended N rate is adapted depending upon nitrate leaching risk Wheat, Maize, Potatoes

Nitrogen
Dry Springs Not Considered
Advice on irrigation for N recommendation Not Provided
Spring Crop N content Not Accounted for
Accepted methods for assessment of spring crop N content
Phosphorus
Spring Crop P content Not Accounted for
Accepted methods for assessment of spring crop P content
Nitrogen
Current in season crop N requirement Not Estimated
Basis for N Requirement Estimation
Expected yields Estimated in season N requirement can be adjusted for expected yields
Basis of crop N requirements
Phosphorus
Current in season crop P requirement Estimated
Basis for P requirement estimation Standard values for crop P content
Expected yields Estimated P requirement can be adjusted for expected yields
Basis of crop P requirements Crop approach, Rotation approach
Potassium
Current in season crop K requirement Estimated
Basis for K requirement estimation Standard Yield
Expected yields Estimated K requirement can be adjusted for expected yields
Crops for which yield adjustments are made None
Adjustments for Potato Recommendations
Recommendations on length of growing season, variety, haulm length and/or determinacy groups Not available
Available adjustments for potatoes Effect of irrigation;N: Crop needs, nutrients in the soil provided by the previous crop, irrigation, residues of the previous crop, nutrient losses by drainage/ percolation, nutrient biological fixation, nutrient immobilisation by microorganisms, nutrient losses by volatilization and denitrification. P: Crop needs, nutrients in the soil provided by the previous crop, irrigation, residues of the previous crop, nutrient losses by drainage/ percolation. This applies also to wheat and corn.;

Adjustments for nitrate leaching, gaseous N-losses and Ammonia Mitigation
N adjustments to account for gaseous N-losses are included for Not included
Fertiliser types and additives change recommendation
Ammonia mitigation strategies used for manufactured fertilisers
Manure application methods used for reducing ammonia emissions
Organic materials nutrient content
Crop available N for different types of organic material Calculated
Organic materials for which crop available N is calculated Farmyard manure (cattle, goat, pig, sheep, horse, duck), Compost, Biosolids
Crop available nutrients from organic materials accounted for Nitrogen (N), Phosphorus (P), Potassium (K)
Nutrients for which there is an option to input own organic material nutrient analysis None
Types of organic materials for which regulation stipulates a sampling requirement None

Guidance on fertilizer application timings Provided, Adjusted for the total amount of nutrient applied
Guidance on the rate of fertiliser to apply at each timing Provided
Number of fertilizer N applications in wheat 3
Application number between maize and potatoes Different
Number of fertiliser N applications in maize (or potatoes) Maize and Potatoes - two N application
P & K application frequency in winter wheat Once a year
P & K application frequency between maize and potatoes Does not differ
P & K application frequency in maize (or potatoes)
Crops with guidance available for the placement of fertilisers Wheat, Maize, Potatoes
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